I want something unusual. While I enjoy fine blends - thank you, Givenchy Gentleman - I often hanker for something that's a study of contrast rather than harmony. I found L'Anarchiste did this quite well, but with such a minimalist palette it never quite satisfies the part of me that wants something thick and rich to "sink my teeth into", metaphorically speaking. L'Anarchiste is a vase of orange blossom and cedar branches sitting in the sunlight; delightful in itself, but I'm always looking for a sister scene of crushed flowers in an incense-filled temple. The notes needn't be specific - though anything easily classified as "fresh" is rarely my thing - but a sense of complexity, a certain "darkness" if you will, and an unusual contrast of elements is always good.
Of course, that's just my dream signature scent at the moment. I tend to be rather chimeric in matters of taste.